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Updated Power monitoring calibration (markdown)

blakadder 2019-02-22 22:48:33 +01:00
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Power-monitoring-calibration.md

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You might need to calibrate your power monitoring device as correct measurements are influenced by hardware and timing differences. You might need to calibrate your power monitoring device as correct measurements are influenced by hardware and timing differences.
For proper calibration you will need: ## What you need
- your power monitoring capable device flashed with Tasmota and configured to a correct module/template that supports power monitoring - your power monitoring capable device flashed with Tasmota and configured to a correct module/template that supports power monitoring
- calibrated multimeter (AC capable) - calibrated multimeter (AC capable)
- incandescent light bulb (we use a 60 W one in the example) - incandescent light bulb (we use a 60 W one in the example)
- (optional) power meter (aka Kill A Watt) - *(optional)* calibrated power meter (aka Kill A Watt)
1. Connect the light bulb to your device. ### Step 1
Connect the light bulb to your device.
* *Optional: Plug your device into the power meter* * *Optional: Plug your device into the power meter*
2. Open the web UI for your device in one window and another window to that same devices Console
3. Turn power on and wait a few seconds for the power metering to settle on a stable power reading Turn power on and wait a few seconds for the power metering to settle on a stable power reading
4. Verify the **Power** reading in the web UI (optionally with the power meter as well) for the expected 60 W and if needed change the power offset with command: <BR>&nbsp;&nbsp;&nbsp;&nbsp;`PowerSet 60.0`<BR>&nbsp;&nbsp;&nbsp;&nbsp;*(if you're using something with different power draw enter the appropriate number)* ### Step 2
5. Verify the **Voltage** reading with the multimeter and if needed change the voltage offset in V with command: <BR>&nbsp;&nbsp;&nbsp;&nbsp;`VoltageSet 235.5`<BR>&nbsp;&nbsp;&nbsp;&nbsp;*(235.5 would be replaced with your measurement which varies depending on the electrical standards and your electrical grid)* Open the web UI to your device in one window and open another window to that same devices Console
6. Verify the **Current** reading by calculating current value (amperage) using formula **P<sub>(W)</sub>/I<sub>(V)</sub>=I<sub>(A)</sub>** and if needed change the current offset in *mA* (mA=A\*1000) with command:<BR>&nbsp;&nbsp;&nbsp;&nbsp;`CurrentSet 254.777`<BR>&nbsp;&nbsp;&nbsp;&nbsp;*(instead of 254.777 enter your calculation value of ***A multiplied by 1000***)* ### Step 3
Verify the **Power** reading in the web UI (optionally with the power meter as well) for the expected 60 W and if needed change the power offset with command: <BR>&nbsp;&nbsp;&nbsp;&nbsp;`PowerSet 60.0`<BR>&nbsp;&nbsp;&nbsp;&nbsp;*(if you're using something with different power draw enter the appropriate number)*
### Step 4
Verify the **Voltage** reading with the multimeter and if needed change the voltage offset in V with command: <BR>&nbsp;&nbsp;&nbsp;&nbsp;`VoltageSet 235.5`<BR>&nbsp;&nbsp;&nbsp;&nbsp;*(235.5 would be replaced with your measurement which varies depending on the electrical standards and your electrical grid)*
### Step 5
Verify the **Current** reading by calculating current value (amperage) using formula **P<sub>(W)</sub>/I<sub>(V)</sub>=I<sub>(A)</sub>** and if needed change the current offset in *mA* (mA=A\*1000) with command:<BR>&nbsp;&nbsp;&nbsp;&nbsp;`CurrentSet 254.777`<BR>&nbsp;&nbsp;&nbsp;&nbsp;*(instead of 254.777 enter your calculation value of ***A multiplied by 1000***)*
Current calculation: Current calculation:
``` ```
@ -22,3 +28,5 @@ W(atts)/(V)oltage=(A)mperes
watts/volts *1000=CurrentSet value watts/volts *1000=CurrentSet value
(60.0/235.5)*1000=254.777 (60.0/235.5)*1000=254.777
``` ```
### End
Congratulations!!! Your device can now reliably monitor power consumption!